How to disable mdadm when running hardware RAID

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http://serverfault.com – My server Dell R210 runs a Debian squeeze with hardware RAID1 (H200) preconfigured. But I notice that there is mdadm running. Sometimes in backup, or in OS upgrade (to Debian 6.0.4), I have messages like this: W: mdadm: /etc/mdadm/mdadm.conf defines no arrays. W: mdadm: no arrays defined in configuration file. Are they safe to ignore? How do I disable mdadm? Just a /etc/init.d/mdadm stop, a bit of observation then apt-get remove mdadm? (HowTos)